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FAN4803CS1X

P1-P3P4-P6P7-P9P10-P12
www.fairchildsemi.com
REV. 1.2.3 11/2/04
Features
• Internally synchronized PFC and PWM in one 8-pin IC
• Patented one-pin voltage error amplifier with advanced
input current shaping technique
• Peak or average current, continuous boost, leading edge
PFC (Input Current Shaping Technology)
• High efficiency trailing-edge current mode PWM
• Low supply currents; start-up: 150µA typ., operating:
2mA typ.
• Synchronized leading and trailing edge modulation
• Reduces ripple current in the storage capacitor between
the PFC and PWM sections
• Overvoltage, UVLO, and brownout protection
• PFC V
CC
OVP with PFC Soft Start
General Description
The FAN4803 is a space-saving controller for power factor
corrected, switched mode power supplies that offers very
low start-up and operating currents.
Power Factor Correction (PFC) offers the use of smaller, lower
cost bulk capacitors, reduces power line loading and stress on
the switching FETs, and results in a power supply fully compli-
ant to IEC1000-3-2 specifications. The FAN4803 includes
circuits for the implementation of a leading edge, average
current “boost” type PFC and a trailing edge, PWM.
The FAN4803-1’s PFC and PWM operate at the same
frequency, 67kHz. The PFC frequency of the FAN4803-2 is
automatically set at half that of the 134kHz PWM. This
higher frequency allows the user to design with smaller
PWM components while maintaining the optimum operating
frequency for the PFC. An overvoltage comparator shuts
down the PFC section in the event of a sudden decrease in
load. The PFC section also includes peak current limiting for
enhanced system reliability.
Block Diagram
I
SENSE
3
VEAO
4
V
DC
5
I
LIMIT
6
GND
2
PWM OUT
8
PFC OUT
1
–
+
–
+
COMP
COMP
35µA
16.2V
17.5V
V
CC
+
–
COMP
+
–
–1V
SOFT START
PFC/PWM UVLO
DUTY CYCLE
LIMIT
OSCILLATOR
PFC – 67kHz
PWM – 134kHz
V
REF
V
REF
1.2V
26k
40k
M1
R1 C1
30pF
M2
M7
M3
M4
M6
PWM
CONTROL
LOGIC
–
+
1.5V
DC I
LIMIT
PFC I
LIMIT
PWM COMPARATOR
V
CC
OVP
PFC OFF
ONE PIN ERROR AMPLIFIER
LEADING
EDGE PFC
TRAILING
EDGE PWM
+
–
COMP
7V
+
–
COMP
–1
–4
REF
V
CC
7
PFC
CONTROL
LOGIC
FAN4803
8-Pin PFC and PWM Controller Combo
FAN4803 PRODUCT SPECIFICATION
2
REV. 1.2.3 11/2/04
Pin Configuration
Pin Description
1
2
3
4
8
7
6
5
PFC OUT
GND
I
SENSE
VEAO
PWM OUT
V
CC
I
LIMIT
V
DC
TOP VIEW
8-Pin SOIC (S08)
8-Pin PDIP (P08)
FAN4803
Pin Name Function
1 PFC OUT PFC driver output
2 GND Ground
3I
SENSE
Current sense input to the PFC current limit comparator
4 VEAO PFC one-pin error amplifier input
5V
DC
PWM voltage feedback input
6I
LIMIT
PWM current limit comparator input
7V
CC
Positive supply (may require an external shunt regulator)
8 PWM OUT PWM driver output
Absolute Maximum Ratings
Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum
ratings are stress ratings only and functional device operation is not implied.
Operating Conditions
Parameter Min Max Unit
I
CC
Current (average) 40 mA
V
CC
MAX 18.3 V
I
SENSE
Voltage -5 1 V
Voltage on Any Other Pin GND – 0.3 V
CC
+ 0.3 V
Peak PFC OUT Current, Source or Sink 1 A
Peak PWM OUT Current, Source or Sink 1 A
PFC OUT, PWM OUT Energy Per Cycle 1.5 µJ
Junction Temperature 150 °C
Storage Temperature Range -65° 150 °C
Lead Temperature (Soldering, 10 sec) 260 °C
Thermal Resistance (
θ
JA
)
Plastic DIP 110 °C/W
Plastic SOIC 160 °C/W
Temperature Range
FAN4803CS-X 0°C to 70°C
FAN4803CP-X 0°C to 70°C
PRODUCT SPECIFICATION FAN4803
REV. 1.2.3 11/2/04
3
Electrical Characteristics
Unless otherwise specified, V
CC
= 15V, T
A
= Operating Temperature Range (Note 1)
Note:
1. Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions.
Symbol Parameter Conditions Min TYP MAX UNITS
One-pin Error Amplifier
V
EAO
Output Current T
A
= 25°C, V
EAO
= 6V 34.0 36.5 39.0 µA
Line Regulation 10V < V
CC
< 15V, V
EAO
= 6V 0.1 0.3 µA
V
CC
OVP Comparator
Threshold Voltage 15.5 16.3 16.8 V
PFC I
LIMIT
Comparator
Threshold Voltage -0.9 -1 -1.15 V
Delay to Output 150 300 ns
DC I
LIMIT
Comparator
Threshold Voltage 1.4 1.5 1.6 V
Delay to Output 150 300 ns
Oscillator
Initial Accuracy T
A
= 25°C 60 67 74 kHz
Voltage Stability 10V < V
CC
< 15V 1 %
Temperature Stability 2 %
Total Variation Over Line and Temp 60 67 74.5 kHz
Dead Time PFC Only 0.3 0.45 0.65 µs
PFC
Minimum Duty Cycle V
EAO
> 7.0V,I
SENSE
= -0.2V 0 %
Maximum Duty Cycle V
EAO
< 4.0V,I
SENSE
= 0V 90 95 %
Output Low Impedance 8 15
Ω
Output Low Voltage I
OUT
= –100mA 0.8 1.5 V
I
OUT
= –10mA, V
CC
= 8V 0.7 1.5 V
Output High Impedance 8 15
Ω
Output High Voltage I
OUT
= 100mA, V
CC
= 15V 13.5 14.2 V
Rise/Fall Time C
L
= 1000pF 50 ns
PWM
Duty Cycle Range FAN4803-2 0-41 0-47 0-50 %
FAN4803-1 0-49.5 0-50 %
Output Low Impedance 8 15
Ω
Output Low Voltage I
OUT
= –100mA 0.8 1.5 V
I
OUT
= –10mA, V
CC
= 8V 0.7 1.5 V
Output High Impedance 8 15
Ω
Output High Voltage I
OUT
= 100mA, V
CC
= 15V 13.5 14.2 V
Rise/Fall Time C
L
= 1000pF 50 ns
Supply
V
CC
Clamp Voltage (V
CCZ
)I
CC
= 10mA 16.7 17.5 18.3 V
Start-up Current V
CC
= 11V, C
L
= 0 0.2 0.4 mA
Operating Current V
CC
= 15V, C
L
= 0 2.5 4 mA
Undervoltage Lockout Threshold 11.5 12 12.5 V
Undervoltage Lockout Hysteresis 2.4 2.9 3.4 V
P1-P3P4-P6P7-P9P10-P12

FAN4803CS1X

Mfr. #:
Buy FAN4803CS1X
Manufacturer:
ON Semiconductor / Fairchild
Description:
Power Factor Correction - PFC PFC/PWM Controller Combo
Lifecycle:
New from this manufacturer.
Delivery:
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